plugins: TrigControl behaves like Control. Fixes #1145
Merge pull request #1146 from supercollider/trig-control-unordered

plugins: TrigControl behaves like Control. Fixes #1145
travis: Ignore homebrew errors.

Homebrew returns non-zero when install / upgrade detects an existing version of the desired package, even if the installed version is perfectly fine (i.e. up to date). There's an open bug on this (https://github.com/Homebrew/homebrew/issues/30939), but until it's dealt with, we'll have to ignore errors from brew install. :(
ide: remove unnecessary signals and add updating on recompile. This fixes #1136
class library: gui: interaction error on failed plot view