Shapeout2

- fix: don't reset color and name of dataset during duplicate
matrix action (96)

- fix: adapt color scheme to work in dark mode (92)

- fix: correctly handle missing features on data export (80)
- ref: cleanup (default arguments and PyQt5 object references)
- setup: bump dclab from 0.34.2 to 0.34.3 (set R_HOME)
- build: bump rpy2 from 3.4.2 to 3.4.5
- build: bump pyqtgraph from 0.12.1 to 0.12.2 and remove
colorbar export workarounds

- fix: false alarms about wrong pyqtgraph version on startup
(removed the responsible code, because there are now more regular
releases of pyqtgraph)
- enh: allow passing session files, datasets, and filters via the
command line (88)
- enh: associate the .so2 file format with Shape-Out on Windows (88)
- build: migrate to Inno Setup 6
- ref: avoid pyqtgraph DeprecationWarning due to `translate`

- fix: migrate to pg.ColorBarItem (with some manual patches from
upstream) to resolve issues with SVG export (87)
- fix: units of viscosity is mPa*s (91)
- setup: bump pyqtgraph from 0.12.0 to 0.12.1
- setup: bump dclab from 0.33.3 to 0.34.2
- ci: fix build issues for macOS

- fix: HTML-escape plot titles and axis labels (82)