!4 同步develop分支

* fix -- 修改获取流程节点信息接口（供前端渲染流程跟踪图着色使用）
* fix -- 修复流程跟踪着色问题
* fix -- 采用ProcessViewer组件显示流程跟踪信息
* fix -- 整合表单设计代码
* fix -- 简易实现用户任务选择用户下拉框内容
* fix -- 修改项目介绍及sql文件
* del -- 移除未使用的文件
* fix -- 修复组件无法显示和修改的问题
* add -- 整合 Rtony/RuoYi-flowable 工作流
* add -- 添加process-designer流程设计插件
* !3 同步ruoyi-vue-plus更新
* !2 登录认证用户信息添加nickName字段（流程任务需要使用到）

ruoyi-ui/src/components/ThemePicker/index.vue

@@ -0,0 +1,173 @@
+<template>
+  <el-color-picker
+    v-model="theme"
+    :predefine="['#409EFF', '#1890ff', '#304156','#212121','#11a983', '#13c2c2', '#6959CD', '#f5222d', ]"
+    class="theme-picker"
+    popper-class="theme-picker-dropdown"
+  />
+</template>
+
+<script>
+const version = require('element-ui/package.json').version // element-ui version from node_modules
+const ORIGINAL_THEME = '#409EFF' // default color
+
+export default {
+  data() {
+    return {
+      chalk: '', // content of theme-chalk css
+      theme: ''
+    }
+  },
+  computed: {
+    defaultTheme() {
+      return this.$store.state.settings.theme
+    }
+  },
+  watch: {
+    defaultTheme: {
+      handler: function(val, oldVal) {
+        this.theme = val
+      },
+      immediate: true
+    },
+    async theme(val) {
+      await this.setTheme(val)
+    }
+  },
+  created() {
+    if(this.defaultTheme !== ORIGINAL_THEME) {
+      this.setTheme(this.defaultTheme)
+    }
+  },
+
+  methods: {
+    async setTheme(val) {
+      const oldVal = this.chalk ? this.theme : ORIGINAL_THEME
+      if (typeof val !== 'string') return
+      const themeCluster = this.getThemeCluster(val.replace('#', ''))
+      const originalCluster = this.getThemeCluster(oldVal.replace('#', ''))
+
+      const getHandler = (variable, id) => {
+        return () => {
+          const originalCluster = this.getThemeCluster(ORIGINAL_THEME.replace('#', ''))
+          const newStyle = this.updateStyle(this[variable], originalCluster, themeCluster)
+
+          let styleTag = document.getElementById(id)
+          if (!styleTag) {
+            styleTag = document.createElement('style')
+            styleTag.setAttribute('id', id)
+            document.head.appendChild(styleTag)
+          }
+          styleTag.innerText = newStyle
+        }
+      }
+
+      if (!this.chalk) {
+        const url = `https://unpkg.com/element-ui@${version}/lib/theme-chalk/index.css`
+        await this.getCSSString(url, 'chalk')
+      }
+
+      const chalkHandler = getHandler('chalk', 'chalk-style')
+
+      chalkHandler()
+
+      const styles = [].slice.call(document.querySelectorAll('style'))
+        .filter(style => {
+          const text = style.innerText
+          return new RegExp(oldVal, 'i').test(text) && !/Chalk Variables/.test(text)
+        })
+      styles.forEach(style => {
+        const { innerText } = style
+        if (typeof innerText !== 'string') return
+        style.innerText = this.updateStyle(innerText, originalCluster, themeCluster)
+      })
+
+      this.$emit('change', val)
+    },
+
+    updateStyle(style, oldCluster, newCluster) {
+      let newStyle = style
+      oldCluster.forEach((color, index) => {
+        newStyle = newStyle.replace(new RegExp(color, 'ig'), newCluster[index])
+      })
+      return newStyle
+    },
+
+    getCSSString(url, variable) {
+      return new Promise(resolve => {
+        const xhr = new XMLHttpRequest()
+        xhr.onreadystatechange = () => {
+          if (xhr.readyState === 4 && xhr.status === 200) {
+            this[variable] = xhr.responseText.replace(/@font-face{[^}]+}/, '')
+            resolve()
+          }
+        }
+        xhr.open('GET', url)
+        xhr.send()
+      })
+    },
+
+    getThemeCluster(theme) {
+      const tintColor = (color, tint) => {
+        let red = parseInt(color.slice(0, 2), 16)
+        let green = parseInt(color.slice(2, 4), 16)
+        let blue = parseInt(color.slice(4, 6), 16)
+
+        if (tint === 0) { // when primary color is in its rgb space
+          return [red, green, blue].join(',')
+        } else {
+          red += Math.round(tint * (255 - red))
+          green += Math.round(tint * (255 - green))
+          blue += Math.round(tint * (255 - blue))
+
+          red = red.toString(16)
+          green = green.toString(16)
+          blue = blue.toString(16)
+
+          return `#${red}${green}${blue}`
+        }
+      }
+
+      const shadeColor = (color, shade) => {
+        let red = parseInt(color.slice(0, 2), 16)
+        let green = parseInt(color.slice(2, 4), 16)
+        let blue = parseInt(color.slice(4, 6), 16)
+
+        red = Math.round((1 - shade) * red)
+        green = Math.round((1 - shade) * green)
+        blue = Math.round((1 - shade) * blue)
+
+        red = red.toString(16)
+        green = green.toString(16)
+        blue = blue.toString(16)
+
+        return `#${red}${green}${blue}`
+      }
+
+      const clusters = [theme]
+      for (let i = 0; i <= 9; i++) {
+        clusters.push(tintColor(theme, Number((i / 10).toFixed(2))))
+      }
+      clusters.push(shadeColor(theme, 0.1))
+      return clusters
+    }
+  }
+}
+</script>
+
+<style>
+.theme-message,
+.theme-picker-dropdown {
+  z-index: 99999 !important;
+}
+
+.theme-picker .el-color-picker__trigger {
+  height: 26px !important;
+  width: 26px !important;
+  padding: 2px;
+}
+
+.theme-picker-dropdown .el-color-dropdown__link-btn {
+  display: none;
+}
+</style>