Add support for Mitsubishi MSZ-AP**VGD/VGK2 series ACs

This adds support for the following Mitsubishi Elecric split systems:

- MSZ-AP25VDG2 (swing mode)
- MSZ-AP25VDKG2 (swing mode)
- MSZ-AP35VDG2 (swing mode)
- MSZ-AP35VDKG2 (swing mode)
- MSZ-AP42VDG2 (swing mode)
- MSZ-AP42VDKG2 (swing mode)
- MSZ-AP50VDG2 (swing mode)
- MSZ-AP50VDKG2 (swing mode)

- Econo cool mode does not support changing swing modes (to fit within the operationMode > fanMode > swingMode > temperature structure, duplicate codes have been added)
- Dry mode does not support changing temperature (all temperature specific codes are duplicates for this mode)
- Heat mode supports temperatures as low as 10 (only temperatures between 16-31 have been added)
- Fan mode does not support changing temperature (all temperature specific codes are duplicates for this mode)