Use clang and enable warnings

Add hotkeys for selecting current rule

Improve texture alignment

Optional size argument

Rewrite interface rules

Fix selection type check

Only handle mousedown event

Remove "NONE" pattern type

Move header file contents to main file

Replace drag-and-drop with clicking

Scale interface based on display size

Fix typo

Expand interface rules

Document user interface

Replace quadrants with array

Change to if-else

Allow dragging from inside rules

Make rendering limit configurable

Extend to 8 rules

Add configurable colors

Improve square drawing