Etabackend

1. add DLCs
2. enable fullscreen for plotly in recipes

1. Drop ETA_LIB completely and swtich to pip

1. Upgrade to LLVM 7
2. add ETA_VERSION checks
3. Revert the downgrade of realtime recipe

**NOTE: site-packages from old ETA versions will be removed when installing this version! Make backups if necessary.**

1.web-based setup for back-end
2.sharing VIs, Timetaggers, and parameters across multiple groups

**NOTE: The Realtime recipe is downgraded mistakenly in this version. Use the one from the previous version**

1. minor UI updates
2. fixing the backend crashing issue when an unsupported file is used

**NOTE: trunc parameter in eta.simple_cut() is now changed to keep_indexes**

1. installer makes a pop-up for installation guide
2. assign CHN16 as the first marker for hydraharp devices.
3. automatic detection for qutag formats