ch ch ch ch changes! big ol overhaul:

- Hidpi support
- Display & edit both sticks individually
- Clearer distinction between raw & filtered position
- Param editing & preview for digital
- Digital has an angle parameter
- Touched up CMakeLists.txt
- gitignore

maths.c

@@ -1,5 +1,8 @@
-#include "vector.h"
+#include "maths.h"
 
 static inline vector VecAdd(vector l, vector r);
-
 static inline vector VecScale(vector v, vec_t x);
+
+static inline double pfmod(double x, double d);
+
+double AccelCurve(double x, double y);