Remove Math Player support (#19239)
Closes #19165
### Summary of the issue:
MathPlayer is no longer maintained and is not 64-bit compatible.
### Description of user facing changes:
MathPlayer is no longer supported by NVDA.
### Description of developer facing changes:
MathPlayer code has been removed.
### Description of development approach:
* Deleted the `mathPres.mathPlayer` module
* Removed `mathPlayer_sconscript` and its callers from the build
system
* Fixed a few comments and strings that mentioned MathPlayer
* Removed MathPlayer from miscDeps nvaccess/nvda-misc-deps#48
### Testing strategy:
Rebuilt NVDA and ensured that it still works and MathCAT continues to
function.
### Known issues with pull request:
None
