PR: Add fix for combobox indicator and padding

[goanpeca]

Fixes #132

The active element is now on bold, was the only thing I could manage to do. It seems the QComboBox implementation under the hood is funky.

On Spyder I still se a small artifact on the corners, but it must be related to something else?

Tested on OSX only

[dpizetta]

Also, need to run script/process_qrc.py to update files. If you could not run, I run here :)

Good job with this issue, but I can see the white corner in Linux Ubuntu yet. Ideas? Still some corner problems from #132

My env:

* OPERATING SYSTEM----------------------------------------------------------------------------------------------
    - System........................ Linux
    - Release....................... 4.15.0-47-generic
    - Platform...................... Linux-4.15.0-47-generic-x86_64-with-debian-buster-sid
    - Version....................... #50-Ubuntu SMP Wed Mar 13 10:44:52 UTC 2019
* PYTHON DISTRIBUTION-------------------------------------------------------------------------------------------
    - Version....................... 3.6.8
    - C Compiler.................... GCC 7.3.0
    - C API Version................. 1013
    - Implementation................ cpython
    - Implementation Version........ 3.6.8
* CONDA DISTRIBUTION--------------------------------------------------------------------------------------------
    - Version....................... 4.6.12
    - Build......................... 3.17.8
* QT ABSTRACTIONS-----------------------------------------------------------------------------------------------
    - qtpy Version.................. 1.7.0
    - qtpy Binding.................. pyqt5
    - pyqtgraph Version............. 0.10.0
    - pyqtgraph Binding............. Not set or inexistent
    - Qt Version.................... 1.1.0
    - Qt Binding.................... PySide2
* QT BINDINGS---------------------------------------------------------------------------------------------------
    - PyQt5 Version................. 5.6
    - PyQt5 Qt Version.............. 5.6.2
    - PySide2 Version............... 5.12.2
    - PySide2 Qt Version............ 5.6.3

[goanpeca]

Good job with this issue, but I can see the white corner in Linux Ubuntu yet. Ideas?

Nope, I tried it on a stand alone QComboBox example and it does not show so I am not sure what is causing it on Spyder.

Also not being able to refresh the stylesheets without having to restart the app makes this process painful :-| (spyder being a relatively heavy app)

[goanpeca]

Also, need to run script/process_qrc.py to update files. If you could not run, I run here :)

@dpizetta I would rather you run it for the moment, I do not have the whole toolchain installed. Thanks!

[dpizetta]

No problems :) I do it soon.

[goanpeca]

No problems :) I do it soon.

Awesome! thanks :-)