Added size option.
Lots of updates.

- Added side scrolling. To enable it, set mods.rp_hotfix.side_scrolling_triggerzone to any value (in px) that you want to be scrollable, I'd recommend 50 or so.
- Other keys:
 * side_scrolling_base_speed: speed, relative to WASD, that side scrolling uses, default 2
 * side_scrolling_speed_multiplier: maximum speed, relative to the base speed, that we can reach when going at the border
- Added fast scrolling. This affects key and side-scrolling movement. To enable it, set mods.rp_hotfix.camera_keys.fast_scrolling to any valid key (for example, "LEFT_SHIFT")
- Fast scrolling's speed can be set using mods.rp_hotfix.fast_scrolling_multiplier (relative to normal speed).
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