Colleen

**Current Behaviour** A crash will occur on `GalaEngine::TileLayer::Render()` if the `tiles` member is less than `width`x`height`. **Expected Behaviour** Tile rendering should stop once it reaches the limit of the `tiles`...

**Current Behaviour** Resizing a TileLayer does not update the texture's size, causing artifacts and corrupted graphics when rendering. **Expected Behaviour** The texture should be properly resized with the layer. **Comment**...

**Current Behaviour** Attempting to draw an entity without a sprite (`nullptr` as the sprite) will segfault. **Expected Behaviour** The sprite should not be drawn, without issue.

Unloading assets doesn't properly release all the associated memory. This *could* be an issue with `Demo_Assets`. Analysis is required.

Fonts are not properly loaded/unloaded when querying new font sizes.

Prerequisite plugins and resources / dependency handling: `.require_plugin()` and `.require_resource()`.

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## What problem does this solve or what need does it fill? Bevy does not currently provide an ergonomic way to handle prerequisite plugins / resources in the same fashion...