Add toolbar color and tweak rstudio theme

Basically all text is now themed

nord-polar-night-aurora.scss

 $ui-rstudio-tabs-selected       : $nord2;
 $ui-rstudio-tabs-selected-color : $nord5;
 $ui-rstudio-toolbar             : $ui-rstudio-tabs-selected;
+$ui-rstudio-toolbar-color       : $ui-foreground;
 $ui-rstudio-search              : $ui-rstudio-toolbar;
 $ui-completions-background      : $ui-background;
 $ui-completions-color           : $ui-foreground;

oceanic-plus.scss

 $ui-rstudio-tabs-selected       : $base02;
 $ui-rstudio-tabs-selected-color : $base07;
 $ui-rstudio-toolbar             : $ui-rstudio-tabs-selected;
+$ui-rstudio-toolbar-color       : $ui-foreground;
 $ui-rstudio-search              : $ui-rstudio-toolbar;
 $ui-completions-background      : $ui-background;
 $ui-completions-color           : $ui-foreground;

rsthemes/nord-polar-night-aurora.rstheme

   color: #FFF !important;
 }
 
+.rstudio-themes-flat .gwt-Label {
+  color: #d8dee9;
+}
+
 .ace_cursor {
   color: #81a1c1;
 }
   background: #434c5e !important;
 }
 
+.rstudio-themes-flat .rstheme_toolbarWrapper button, .rstudio-themes-flat .rstheme_toolbarWrapper a, .rstudio-themes-flat .rstheme_toolbarWrapper div {
+  color: #d8dee9 !important;
+}
+
 .rstudio-themes-flat .rstudio-themes-dark-grey {
   /* spliters */
 }

rsthemes/oceanic-plus.rstheme

   color: #FFF !important;
 }
 
+.rstudio-themes-flat .gwt-Label {
+  color: #D8DEE9;
+}
+
 .ace_cursor {
   color: #FAC863;
 }
   background: #4F5B66 !important;
 }
 
+.rstudio-themes-flat .rstheme_toolbarWrapper button, .rstudio-themes-flat .rstheme_toolbarWrapper a, .rstudio-themes-flat .rstheme_toolbarWrapper div {
+  color: #D8DEE9 !important;
+}
+
 .rstudio-themes-flat .rstudio-themes-dark-grey {
   /* spliters */
 }

rsthemes/solarized-dark.rstheme

   color: #FFF !important;
 }
 
+.rstudio-themes-flat .gwt-Label {
+  color: #839496;
+}
+
 .ace_cursor {
   color: #dc322f;
 }
 
 .ace_keyword {
   font-style: italic;
-  color: #dc322f;
+  color: #859900;
 }
 
 .ace_keyword.ace_operator {
 }
 
 .ace_constant.ace_language {
-  color: #d33682;
+  color: #cb4b16;
 }
 
 .ace_constant.ace_numeric {
 
 .ace_support.ace_class {
   font-style: italic;
-  color: #859900;
+  color: #dc322f;
 }
 
 .ace_support.ace_type {
-  color: #859900;
+  color: #dc322f;
 }
 
 .ace_paren.ace_keyword.ace_operator {
 }
 
 .ace_storage {
-  color: #dc322f;
+  color: #859900;
 }
 
 .ace_storage.ace_type {
-  color: #dc322f;
+  color: #859900;
 }
 
 .ace_invalid {
-  background-color: rgba(203, 75, 22, 0.5);
+  background-color: rgba(108, 113, 196, 0.5);
 }
 
 .ace_invalid.ace_deprecated {
-  background-color: rgba(220, 50, 47, 0.5);
+  background-color: rgba(133, 153, 0, 0.5);
 }
 
 .ace_string {
 }
 
 .ace_variable {
-  color: #cb4b16;
+  color: #6c71c4;
 }
 
 .ace_variable.ace_parameter {
 }
 
 .ace_entity.ace_name.ace_tag {
-  color: #cb4b16;
+  color: #6c71c4;
 }
 
 .ace_entity.ace_other.ace_attribute-name {
-  color: #dc322f;
+  color: #859900;
 }
 
 .ace_bracket {
 }
 
 .nocolor.ace_editor .ace_line span {
-  color: #dc322f !important;
+  color: #859900 !important;
 }
 
 /* ---- RStudio Theme ---- */
 }
 
 .rstudio-themes-flat .rstudio-themes-dark-grey .gwt-TabLayoutPanelTab-selected .gwt-Label {
-  color: #eee8d5;
+  color: #fdf6e3;
 }
 
 .rstudio-themes-flat {
   background: #586e75 !important;
 }
 
+.rstudio-themes-flat .rstheme_toolbarWrapper button, .rstudio-themes-flat .rstheme_toolbarWrapper a, .rstudio-themes-flat .rstheme_toolbarWrapper div {
+  color: #eee8d5 !important;
+}
+
 .rstudio-themes-flat .rstudio-themes-dark-grey {
   /* spliters */
 }

rstudio/_rstudio-dark.scss

 	&.editor_dark.ace_editor_theme a {
 		color: #FFF !important;
 	}
+	.gwt-Label {
+	  color: $ui-foreground;
+	}
 }
 .ace_cursor {
 	color: $ui-cursor;
 .rstudio-themes-flat {
   .rstheme_toolbarWrapper {
     background: $ui-rstudio-toolbar !important;
+    button, a, div {
+      color: $ui-rstudio-toolbar-color !important;
+    }
   }
 	.rstudio-themes-dark-grey {
 		/* spliters */