card_fields rewrite and magic-modules.mse-include (#21)

Overhauls the card_fields file to allow for template designers more freedom in manipulating data.

Adds magic-modules.mse-include, a large scale include file for building templates in a standardized way. Applying this to existing frames will be coming in future updates.

data/magic-modules.mse-include/rarities/readme.txt

@@ -0,0 +1,49 @@
+#### Consider using the Typelines module instead of this one
+
+#### To use this include in a template, add the following in the template headers:
+depends on:
+	package:			magic-modules.mse-include
+	version:			2024-05-20
+
+#### Also add this, unindented, before the card style section:
+include file: /magic-modules.mse-include/rarities/card_fields
+#### For DFC or TFC templates, instead override the faces_coordinates function, and use:
+include file: /magic-modules.mse-include/rarities/card_fields_dfc
+include file: /magic-modules.mse-include/rarities/card_fields_tfc
+
+#### Also add this among the styling field section,
+#### (styling fields will appear in the order you place them):
+#### This will add a text option for customizing the colors used by the rarity symbol,
+#### and another to further tweak the positioning of the rarity symbol.
+include file: /magic-modules.mse-include/rarities/styling_fields
+
+#### Default Field Placement (@375x523, w=1 h=1)
+rarity:
+	left:   317w
+	top:    297h
+	width:  24w
+	height: 24h
+#### Customization
+#### Optionally, you can define which face of the card the rarity should snap to,
+#### by defining the following function in the init script:
+typeline_face_1 := { 1 }
+
+#### You can also adjust global alignment by defining the following functions, again in the init script,
+#### which must return an int corresponding to the number of pixels you want to shift the rarity by:
+
+#### To shift the rarity up/down:
+rarity_offset_top_1 := { 0 }
+
+#### To shift the rarity left/right:
+rarity_offset_left_1 := { 0 }
+
+#### To increase/decrease the width and height of the rarity:
+rarity_offset_size_1 := { 0 }
+
+#### For DFC or TFC templates, use:
+rarity_offset_top_2 := { 0 }
+rarity_offset_left_2 := { 0 }
+rarity_offset_size_2 := { 0 }
+rarity_offset_top_3 := { 0 }
+rarity_offset_left_3 := { 0 }
+rarity_offset_size_3 := { 0 }