Added custom cursor images for bucket & color picker

- Custom cursor images for bucket & color picker, only when mapped to the left button
- Cursor is now invisible when the left chosen tool is anything but bucket, color picker and rectangle select.
- Improved and added more hint tooltips.

Assets/Graphics/Tools/Bucket_Cursor.png.import

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+type="StreamTexture"
+path="res://.import/Bucket_Cursor.png-8abbae452d9f96bd83cd2d0982f01047.stex"
+metadata={
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+}
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+
+source_file="res://Assets/Graphics/Tools/Bucket_Cursor.png"
+dest_files=[ "res://.import/Bucket_Cursor.png-8abbae452d9f96bd83cd2d0982f01047.stex" ]
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+flags/srgb=2
+process/fix_alpha_border=true
+process/premult_alpha=false
+process/HDR_as_SRGB=false
+process/invert_color=false
+stream=false
+size_limit=0
+detect_3d=true
+svg/scale=1.0

Assets/Graphics/Tools/ColorPicker_Cursor.png.import

@@ -0,0 +1,34 @@
+[remap]
+
+importer="texture"
+type="StreamTexture"
+path="res://.import/ColorPicker_Cursor.png-85822710d85a1ad1331ab050f6c87cad.stex"
+metadata={
+"vram_texture": false
+}
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+[deps]
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+source_file="res://Assets/Graphics/Tools/ColorPicker_Cursor.png"
+dest_files=[ "res://.import/ColorPicker_Cursor.png-85822710d85a1ad1331ab050f6c87cad.stex" ]
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+flags/srgb=2
+process/fix_alpha_border=true
+process/premult_alpha=false
+process/HDR_as_SRGB=false
+process/invert_color=false
+stream=false
+size_limit=0
+detect_3d=true
+svg/scale=1.0