FEAT: Add new overlays (#1101)

Add new set of overlays:
- GBA_REAL made by me: realistic and bright pixel grid overlays for GBA,
with or without GBA logo
- Perfect_CRT made by 1playerinsertcoin: realistic and bright CRT
overlay with scanlines and phosphor effect without color deviation, with
or without rounded frame

For the Perfect_CRT one its author gave me its consent for this PR here:
https://www.reddit.com/r/MiyooMini/comments/15gq899/comment/juoftas/?context=3,
and I credited him in the commit

---------

Co-authored-by: 1playerinsertcoin <[email protected]>

static/build/RetroArch/.retroarch/overlay/4-3/CRT/Perfect_CRT-noframe.cfg

@@ -0,0 +1,6 @@
+overlay0_overlay = Perfect_CRT-noframe.png
+overlay0_descs = "0"
+overlay0_full_screen = "true"
+overlay0_name = "overlay0"
+overlay0_normalized = "true"
+overlays = "1"

static/build/RetroArch/.retroarch/overlay/4-3/CRT/Perfect_CRT.cfg

@@ -0,0 +1,6 @@
+overlay0_overlay = Perfect_CRT.png
+overlay0_descs = "0"
+overlay0_full_screen = "true"
+overlay0_name = "overlay0"
+overlay0_normalized = "true"
+overlays = "1"

static/build/RetroArch/.retroarch/overlay/GBA/GBA_REAL_3x-clean.cfg

@@ -0,0 +1,4 @@
+overlays = 1
+overlay0_overlay = GBA_REAL_3x-clean.png
+overlay0_full_screen = false
+overlay0_descs = 0

static/build/RetroArch/.retroarch/overlay/GBA/GBA_REAL_3x-logo.cfg

@@ -0,0 +1,4 @@
+overlays = 1
+overlay0_overlay = GBA_REAL_3x-logo.png
+overlay0_full_screen = false
+overlay0_descs = 0