Adds this CPU speed print support to the web debug panel.

In some versions of WASM-bindgen the re-setting of the hook from the current panicking thread would fail.

This makes it possible to select CBG or DMG mode taking into consideration the CGB flag in the ROM file.

Including CGB and DMG.

Created more panic conditions for the KEY0 and KEY1.

Done that by making use of the new emukit features.

The new event driven strategy works better with react.

This makes uses of WASM to JS pipeline.

Callback is done using a global window function.
Printing is performed to the console output.
This is still a work in progress and the final display of the image should be included in the Web interface.

The components have been moved from emukit.

Also added CH4 public WASM API

This allows better understanding of the ROMs and their purpose.

Also fixed small channel 3 issue

There's still no control over the channels themselves, but the basic interleaved buffer support is now coded.
There's also new support for buffer size definition in seconds.

Will allow performance update when not using audio.
Done for benchmark purposes.

Makes use of the new emukit audio code.

There are a series of hacks involved in making a constant stream of audio data to work OK with web audio.

Uses built package to print dependencies.

Normalized handling of ticks in SDL according to the Web version implementation.

Uses the `build.rs` file to generate compile time information about the build environment.
This information is exposed to the WASM environment through interface methods that are then used by the `Emulator` interface.

Theme stored in `localStorage`