Including liquibyte theme with other themes causes other themes(when
in use) to not look right. For example there will be underline text
decorations when a text is selected in default theme.

...because the original blue on black background is difficult to read.

Removed possible testing and unreachable code to avoid JavaScript
compiler errors:

...
codemirror/mode/coffeescript/coffeescript.js:271: WARNING - unreachable code
    if (false && current === ".") {
...

Closes #3558

support more arch/preamble/sections and fix clearing control flow
state.

* Removes like, ilike.
* Adds starts, ends, contains, toString, size, reverse.

Issue #3550

Make it actually work, document it, declare the option,
make sure the code runs on pre-ES5 browsers.

Issue #3550

Closes #3548

Which was (possibly accidentally) dropped in the input style overhaul.

Closes #3555

Closes #3549

Issue #3548

Issue #3548

Issue #3525

Issue #3525

Issue #3536

I don't much care anymore, might move to semicolon-free style in future

So that the xu/msgenny modes can be dynamically loaded from meta.js

Issue #3523

Issue #3496

Issue #3542

In C++14, the single-quote character may be used arbitrarily
as a digit separator in numeric literals.