Harden menu against crashing

Keep the menu running even if the invoked compiler crashes badly.

Fix color palette of resized image

It looks like Imagemagick messes up the palette when resizing an image.

In order to work around this, the routine now always reduces color when
resizing, even if the original palette was already correct.

Fix repeated variable names when using similar file names.

This fixes a bug, where both 1chr1v1.png and #1chr1v1.png used to produce the same variable name, causing compilation errors.

Fix bug that happened when the background filenames had special chars.

This fixes #87 
Merge pull request #108 from haroldo-ok/special-chars-on-filenams

Use packaging on the editor frontend to reduce distribution size.

Merge pull request #104 from haroldo-ok/bundle
This fixes #103

Fix background image display bug

This version fixes a memory leak problem on the text buffer that would, sometimes, make images be displayed incorrectly.

Fix editor save bug

Built-in code editor

Merge pull request #90 from haroldo-ok/editor

Implemented a code editor. It can be invoked by calling:

```bash
node . edit
```

It will open a backend on port 1235, a frontend in port 1234 and will launch a browser instance.

This fixes #88

Built-in code editor

Implemented a code editor. It can be invoked by calling:

node . edit

It will open a backend on port 1235, a frontend in port 1234 and will launch a browser instance.

Implement support for ADPCM for both music and sound

• Added the adpcm flag that can be set for the sound and music commands;
• When using the ADPCM flag, it is now possible to use a .wav file as background music.

When clearing the foreground, deallocate the tiles used by the `*image` command.

Fix tileset leakage

Merge pull request #83 from haroldo-ok/tileset-leakage
This fixes #82