v1.6.0-beta: Travis Mac build config (#184)

* deploy_mac update guess

* add travis config for mac

* update for brew QTDIR

* travis: add language setting

* fix qmake path

* travis: cache homebrew downloads

* travis: qmake script step issues

* travis: try skipping brew update for speed

* travis: fix build dir

* travis mac: add mpv install

* travis mac: build with Qt multimedia

* travis mac: remove unwanted dir change

* more deploy paths tweaks

* travis mac: fix deploy script failure due to existing dir

* on tag, zip orion.api and upload to github releases using GITHUB_API_KEY from travis environment settings

* a note about the github access token

* add s3 upload provider; run providers on all branches

* fix travis yaml spacing

* travis mac: make zip non-conditional; use artifacts dir for zip as s3 deploy doesn't seem to support file param

* travis mac: if statement missing then

* travis mac: not sure what's up with existing orion.app, but let's try not clobbering it

* reenable fixlibs

* fix deploy_mac working directory for fixlibs

* trying something else

* specify qt version

* correct brew formula version

* fix typo

* travis mac: use QTDIR value from brew installed package details

* eliminate non-functional export

* Revert "eliminate non-functional export"

This reverts commit c8f97c785f30db5a58ddf1b848a10fef9e452d08.

* remove array wrapper from jq output

* remove quotes from jq output

* in fixlibs also handle dylibs with $QTDIR/lib absolute references instead of rpaths

* add more lib paths fo fixlibs

* preserve symlinks

* cleanup

* travis mac: remove unused QTVER

* travis mac: clarify comments

* travis mac: clarify mac-specific parts for future non-mac travis builds

* travis mac: fix env var