Fixes and improvements for basegame

[JayFoxRox]

To be upstreamed in the future (or to be taken on demand if I don't PR it):

• This allows to resize the window properly
• Moves records.bin so no folder is necessary
• Avoid some crashes
• Avoids some warnings
• Simplifies code readability

There are many remaining issues from either my changes or the base game though (aside from just the code quality):

• Sometimes characters become invisible or they have strange graphics where they should be transparent.
• If the game is too small, the text becomes almost unreadable.
• The score is also hard to read because of clouds. It should have a shadow / outline
• The aiming line is occasionally getting heavy aliasing.
• You have to move the mouse before input is accepted (not an issue in emscripten).
• No gamepad support.
• Dead buttons in menu.
• Bottom side of enemies often feels "unfair".
• Weird aspect ratio (almost 720p, but not quite).
• Very dependent on RNG; should have a challenge mode or selectable seeds (and contain seeds in scoreboard?).
• The background of the HTML is white, but the background of my resolution change is black.