Drop the "2" in QWC2

[vpicavet]

Communication and identification of the project would be much clearer if we would not have the 2 in QWC2.

This proposal is to "drop the 2" in QWC, and just call the solution "QWC : QGIS Web Client".

QWC version 1 has been very confidential, and there is no need to keep version 2 identified as its successor.

Without the 2, it will be more straightforward, easier to identify the project, easier to type, easier to pronounce, easier to search, and will avoid users to ask why it is called version 2 in its title name.

[manisandro]

This could make sense, one additional point which I believe could be addressed is the current qwc2-demo-app vs qwc2 modules structure. Indeed I believe that the "demo-app" designation has become suboptimal, as the number of customization options which were implemented in the past couple of years has greatly reduced the need for compiling a custom application for most users. This option should clearly remain available for advanced users, but maybe just renaming qwc2-demo-app to something like qwc-app (or perhaps just plain QWC, and renaming the current qwc2 to qwc-modules) could be an idea.