Replace Qt4 Deps with Qt5 deps

[bionade24]

kwT

[fmauch]

As v1.9.5 is the first octovis version supporting Qt5, but the released melodic version is still 1.9.0. I basically see two options:

• Release v1.9.5 to AUR which potentially might have negative side-effects on packages depending on this. There is no package depending on octovis, but releasing octovis in version 1.9.5 while keeping octomap with version 1.9.0 might not work very nice.
• Manually patch v1.9.0 to work with Qt5. While I don't really appreciate this in terms of work effort, this might be the best solution compatibility-wise.