[UI/UX] Update the look & feel of the GUI (#2884)

* Add @CodingWonders to the About page for his contribution and determination to make WinUtil (and MicroWin) the best software it can be!

* Remove the 'LogoSize' Parameter for About page - Make every sponsor in the sponsors list a link to ChrisTitusTech's Sponsors web link

* Change Theme Option name from 'ConfigTabButtonFontSize' to 'ConfigUpdateButtonFontSize' - Lower its value from 16 to 14

* Change Theme Option name from 'FontSizeHeading' to 'HeadingFontSize' for consistency

* Update 'LinkForegroundColor' for Light Theme to be lighter which'll make link hover color more noticeable

* Update 'Show-CustomDialog' Private Function

- Made a lot of theming/styling choices for Custom Dialogs exposed as parameters.
- Update the documentation for these new parameters in 'Show-CustomDialog' Function.
- Add a Link Hover Effect using 'Add_EVENT' methods (This can be tweaks/tuned-down if needed).
- Made use of 'Title' Parameter for 'Show-CustomDialog' Function inside 'scripts/main.ps1' script, to change Dialog Window Title.
- Now you can change the Logo Size of WinUtil through the 'LogoSize' Theming Option (the option was there, but not used in implementation).

* Preprocessing result

* Fix Settings Popup not closing after losing focus - Add trivial null checks for better debugging of UI code

* Remove unnecessary whitespace indentation in 'main.ps1' script

* Add a new 'Invoke-WPFPopup' Function to Better Handle Showing/Hiding/Toggling of Popups

* Improve 'Invoke-WPFPopup' by @MyDrift-user

Thanks for the improvements :)

---------

Co-authored-by: MyDrift <personal@mdiana.ch>
Co-authored-by: Chris Titus <contact@christitus.com>

config/themes.json

@@ -2,12 +2,12 @@
     "shared":{
         "CustomDialogFontSize":       "12",
         "CustomDialogFontSizeHeader": "14",
-        "CustomDialogIconSize":       "25",
+        "CustomDialogLogoSize":       "25",
         "CustomDialogWidth":          "400",
         "CustomDialogHeight":         "200",
         "FontSize":         "12",
         "FontFamily":       "Arial",
-        "FontSizeHeading":  "16",
+        "HeadingFontSize":  "16",
         "HeaderFontFamily": "Consolas, Monaco",
         "CheckBoxBulletDecoratorSize": "14",
         "CheckBoxMargin": "15,0,0,2",
@@ -27,7 +27,7 @@
         "ButtonFontFamily": "Arial",
         "ButtonWidth":      "200",
         "ButtonHeight":     "25",
-        "ConfigTabButtonFontSize":      "16",
+        "ConfigUpdateButtonFontSize":   "14",
         "SearchBarWidth":               "200",
         "SearchBarHeight":              "26",
         "SearchBarTextBoxFontSize":     "12",
@@ -44,7 +44,7 @@
         "MainForegroundColor":  "#232629",
         "MainBackgroundColor":  "#F7F7F7",
         "LabelBackgroundColor":  "#F7F7F7",
-        "LinkForegroundColor":  "#232629",
+        "LinkForegroundColor":  "#484848",
         "LinkHoverForegroundColor":  "#232629",
         "ScrollBarBackgroundColor": "#4A4D52",
         "ScrollBarHoverColor": "#5A5D62",