Forms, Animators, RichParagraph and refactor to themes and utilities

• Fixed crash with Turkish locale and loading textures (and potentially other languages).
• Moved default size property to be part of the theme stylesheet, and not hard-coded (note: this breaks old themes - need to add the new property).
• Improved return value of the message boxes utility to return a useful object with Close() function.
• Added auto height properly for panels.
• Added optional custom texture for panels.
• Improved multicolor paragraph efficiency when don't actually have colors (removed redundant calculations).
• Added utility to generate grid / columns.
• Changed built-in themes default scales to produce sharper results.
• Turned 'MulticolorParagraph' into 'RichParagraph' and added option to change font style.
• Added new built-in style instructions for RichParagraph.
• Added animators, currently including: typewriter, fadeout, and float up-down animations.
• Added per-character animations.
• Added 'Forms' to quickly create a UI form and fetch fields data using a simple list of field descriptors.
• Made paragraph of message boxes RichParagraph by default.
• Misc code refactors and improvements.