Fix incorrect dialog flags in save project dialog
Modernize build system for wxWidgets 3.x and autotools
Update ChangeLog
Bump version to 2.9.23
Added tag 2.9.21 for changeset 2d4aeb9ca433
Added tag 2.9.22 for changeset 61865cbe74ba
Fixes for gcc-15 (Lukas Wirz)
Remove FIND_PACKAGE(PkgConfig) (Andreas Metzler)