Clean App.js

refactor RightHandPanel

Add global registry

Commits reorganisation

* Removed div.terminal_bg whose purpose was to hold the background SVG, as this div was occluding the scrollbar, and instead set SVG as the background-image of div.terminal_container using CSS.
* As CSS does not have a background-opacity directive, manually decoded, edited and re-encoded the SVGs (light, dark) so that all <g>s are wrapped in a top-level <g opacity="0.1">
* Improved the rules of how the background image resizes

Fix terminal call

Added copy buttons for ABI and Bytecode

Remove id from MultiParam input

Fixed issue #1292; terminal scrollbar may now be scrolled

Add ability to filter out compiler warnings