area: Remove unnecessary allocation

button: Fix typo

Bind simple dialogs

Bind uiRadioButtons

Bind uiEditableCombobox

Implement control_is_visible and control_is_enabled

Bind uiCombobox

Bind uiMenu and uiMenuItem

Bind uiMultilineEntry

Bind uiColorButton

Bind uiForm and use it in the demo

Bind uiProgressBar

Reformat and sort controls union

demo: Remove unnecessary box wrapper around the area

area: Make names consistent with the rest of the library

Simplify boolean getters

Move bindings to libui:: instead of ui::

Prevents possible conflicts with generic internal UI modules

Improve README

Clean up the build system

Use *opaque instead of *void