v0.4.0a3

What's Changed

• Feature/add getpixelformat by @Fixstars-momoko in #54
• check update availability by @Fixstars-momoko in #55
• added the new directory for C++ release package by @Fixstars-momoko in #56
• updated the ubuntu version by @Fixstars-momoko in #58
• Feature/organize the structure by @Fixstars-momoko in #57
• added missing header file by @Fixstars-momoko in #59
• added missing header by @Fixstars-momoko in #60
• Fix glib to 2.72 by @Fixstars-momoko in #61

Full Changelog: v0.3.5...v0.4.0a3