Yoshimi 2.3.3.2

[folderol]

Quite a lot of improvements have been made. Most of them are invisible to the user, but clear up potential issues on some platforms.
The startup is smoother and slightly quicker.
The Vector Control window is better sychronised with the other windows.
Display Theme management is better.
User Guide version discovery faster.
Improved self-build instructions.
Various bugs squashed.