* allowed and enabled per_pixel_transparency
* Added a Transparency menu
* Added an Alternate screen for transparency
* Added transparency methods
Added the transparency methods plus modified fullscreen such that it resets transparency on toggling hence, Removing the issue of blackness
* Modified the shader to allow transparency
* Added a material to ViewportContainer
Fixed the bug that darkens image when decreasing opacity
* Update Global.gd
* Update Main.gd
* Update TopMenuContainer.gd