Progress bar widget

[sergeyglazyrindev]

We should add progress bar widget as it is exists in the old uadmin implementation.
An example of its configuration:

get_schema_test.go:                     // P1           int     `uadmin:"progress_bar"`
get_schema_test.go:                     // P2           float64 `uadmin:"progress_bar"`
get_schema_test.go:                     // P3           float64 `uadmin:"progress_bar:1.0"`
get_schema_test.go:                     // P4           float64 `uadmin:"progress_bar:1.0:red"`
get_schema_test.go:                     // P5           float64 `uadmin:"progress_bar:1.0:#f00"`
get_schema_test.go:                     // P6           float64 `uadmin:"progress_bar:0.3:red,0.7:yellow,1.0:lime"`
server_test.go: P1           int     `uadmin:"progress_bar"`
server_test.go: P2           float64 `uadmin:"progress_bar"`
server_test.go: P3           float64 `uadmin:"progress_bar:1.0"`
server_test.go: P4           float64 `uadmin:"progress_bar:1.0:red"`
server_test.go: P5           float64 `uadmin:"progress_bar:1.0:#f00"`
server_test.go: P6           float64 `uadmin:"progress_bar:0.3:red,0.7:yellow,1.0:lime"`

Corresponding html from previous implementation:

progress bar widget
                 {{else if or (eq $type "number") (eq $type "progress_bar")}}
                  <td style="width:80%;" class="search">
                    <label class="col-sm-12 control-label form_label visible-xs" data-toggle="tooltip" data-placement="bottom" title="{{ .Help }}"><span class="camelcaseFix">{{.DisplayName}}</span>{{ if eq .Help "" }}{{ else }}<span class="text-muted" style="font-size:12px;"> <i class="fa fa-question-circle"></i>{{end}}:{{ if .Required }}<span style="color:#f00;font-weight:bold;">&nbsp;*</span>{{end}}</label>
                    <div class="col-sm-12">
                      <div class="input-group col-sm-12">
                        {{if and (eq .ApprovalAction 0) (ne .ChangedBy "")}}
                        <div class="input-group-addon" style="font-family:monospace;;overflow:hidden;max-width:200px;text-overflow:ellipsis;" title="{{.ChangedBy}} {{.ChangeDate.Format "2006-01-02 15:04"}}">
                          <a href="{{$RootURL}}approval/{{.ApprovalID}}" style="text-decoration:none;"><i class="fa fa-exclamation-triangle" style="color:#ffc028"></i> {{.NewValue}}</a>
                        </div>
                        {{else if eq .ApprovalAction 1}}
                        <div class="input-group-addon" style="font-family:monospace;" title="{{.ApprovalBy}} {{.ApprovalDate.Format "2006-01-02 15:04"}}">
                          <i class="fa fa-check" style="color:lime"></i>
                        </div>
                        {{else if eq .ApprovalAction 2}}
                        <div class="input-group-addon" style="font-family:monospace;" title="{{.ApprovalBy}} {{.ApprovalDate.Format "2006-01-02 15:04"}}">
                          <i class="fa fa-times" style="color:red"></i>
                        </div>
                        {{end}}
                        <input class="form-control" name="{{.Name}}" type="number" step="0.01" value="{{.Value}}"{{if .Required}} required {{end}}{{if ne .Max ""}} max="{{.Max}}" {{end}}{{if ne .Min ""}} min="{{.Min}}" {{end}}{{if $is_readonly}} readonly {{end}}{{if ne .Pattern ""}} pattern="{{.Pattern}}" {{if ne .PatternMsg ""}}oninvalid="setCustomValidity('{{.PatternMsg}}')" {{end}}{{end}} style="border-radius:{{if ne .ChangedBy ""}}0px 4px 4px 0px{{else}}4px;{{end}}">
                      </div>
                      {{ if eq .Help "" }}{{ else }}<span class="text-muted" style="font-size:12px;"><i class="fa fa-question-circle"></i> {{.Help}}</span>{{ end }}
                      {{if ne "" (.ErrMsg)}}<span class="text-muted" style="font-size:12px; color:red;"><i class="fa fa-question-circle"></i> {{.ErrMsg}}</span>{{ end }}
                    </div>
                  </td>

temp := template.HTML(fmt.Sprintf("<div style='border:solid 1px;'><div style='width:%d%%; background-image:linear-gradient(%s,%s); text-align:center;'>%.2f</div></div>", int(tempProgressWidth), tempGradient1, tempGradient2, tempProgressValue))