version 3-theydo

• fixes a problem with I/O writes which may cause clicking during PWM audio playback
• merges Android and main trees in one single-source tree
• slightly simplified build system, some pretend-packaging for debian, raspbian and windows; usable binary for macos
• the scripts to open BASIC programs are now included and pre-configured, .sh and .bat files provided for easy launching
• bas2asc python3 script for bas 2 asc and asc to bas also included in the packages
• gdb-z80 still supported but not included