Apply maths macros and type changes ahead of HAL

Marlin/G26_Mesh_Validation_Tool.cpp

Marlin/I2CPositionEncoder.cpp

Marlin/I2CPositionEncoder.h

Marlin/Marlin.h

Marlin/Marlin_main.cpp

Marlin/digipot_mcp4018.cpp

Marlin/digipot_mcp4451.cpp

Marlin/gcode.h

Marlin/least_squares_fit.cpp

Marlin/least_squares_fit.h

Marlin/macros.h

Marlin/nozzle.cpp

Marlin/nozzle.h

Marlin/planner.cpp

Marlin/planner.h

Marlin/planner_bezier.cpp

Marlin/qr_solve.cpp

Marlin/serial.h

Marlin/temperature.cpp

Marlin/ubl_G29.cpp