Mac build fixes

start adding kiosk mode for touch based devices

JUCE update to 6.0.8 (gcc-10 builds the project now)

Merge pull request #155 from keinstein/JUCE_exe_name

Merge pull request #185 from keinstein/keinsteins_fixes

Remove duplicate registration of standard lua libaries.

Move inttypes.h out of the way in case the platform provides its own version.

Remove sueless grabKeyboardFocus() calles.

Use the user document directory if the file choser directory is invalid.

CtrlrFixedSlider: don't set range if the the uiFixedSliderContent property is empty.

Draw background only when it is visible.

Use makefile for generation of precompiled headers.

constexpr for c++14 builds

Don't set the crash handler when we are the crash handler.

Gracefully work when slider properties are not set up properly.