Removing of fonts in graphics object

[halemmerich]

Espruino 2v15.136, Bangle.JS 2 Graphics.reset() does not remove a font correctly (memory stays used)

Test code:

Graphics.prototype.setFontPaytoneOne = function(scale) {
  this.setFontCustom(E.toString(require('heatshrink').decompress(atob('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'))), 46, atob("ITZOMzs7SDxHNUdGIQ=="), 113 + (scale << 8) + (1 << 16));
  return this;
};

print("Before", process.memory().usage, g.getFont());
g.setFont("PaytoneOne");
print("After", process.memory().usage, g.getFont());
g.setFont("4x6");
print("setFont", process.memory().usage, g.getFont());

print();

print("Before", process.memory().usage, g.getFont());
g.setFont("PaytoneOne");
print("After", process.memory().usage, g.getFont());
g.reset();
print("reset", process.memory().usage, g.getFont());

Result:

Before 963 4x6
After 1690 Custom
setFont 963 4x6

Before 963 4x6
After 1690 Custom
reset 1690 4x6

setFont frees the memory used by the font, while reset does not. The font config itself is reset.

Found during experiments on issue https://github.com/espruino/BangleApps/issues/2241