Might or might not have broken DSO-138... No hardware to test....

Getting somewhere but still a lot of outstanding issues remaining.
Encoder works better but is still pretty terrible...

- Improve encoder by toggling on/off EXT IRQ's in Display Routine
- Multiple small bug-fixes...

- Better calibration for ADC->Volt multiplier for Stats
- Slighly faster Display/encoder switching
- General code cleanup...

- Only calculate stats over visible samples (Not sure yet if that's a
good idea as it affects frequ-calc)
- Add function option (At the moment only serialdump works)

- Add zoom (or better unzoom)
- Add Trigger Source
- Add Trigger on Change Mode

Complete Code Rewrite....

Fix unresponsive buttons by aboarting sampling on IRQ...

This reverts commit b19af8b.

Improve button behavior

fix compile on linux/mac (move contents of src to Src)

PlatformIO built simplifies the usage

This adds support for the ST7789 based board.

adding PlatformIO build support

- Doubled capture buffer depth
- Added microcontroller overclock
- Extended Zoom Range
- Added Defein for rotated displays (Autodetect currently doesnt work, it's a define in global.h)

Optimize drawing

Add confirugration validation at startup

Show Display ID on command line and reverse logic so we only use rotating code when we have positivly ID'd a ST7789