Stop special-casing Fiji for Open StartupMacros

We have a better method now: we installed a StartupMacros you do not
have to override any longer because it run automatically all .ijm
files in macros/AutoRun/.

Therefore, we will never need to let the user override
StartupMacros.txt anymore.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
No longer patch ImageJ 1.x to know about StartupMacros.fiji.ijm

Since 1.47i, ImageJ 1.x knows this file and uses it if present.

It would have been nice to be notified about that change in core
ImageJ 1.x, but somehow that information found its way to this
developer anyway.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
fiji-compat: move all HTTPS handling to ij-legacy

There is really nothing life science-specific to https:// handling.
Therefore, ImageJ2 is a much better home to it than Fiji (which Is
Just ImageJ, but specializes in life science).

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
fiji-compat: move Script Editor hooks to ij-legacy

Again, there is nothing life science-specific to the hooks inserted
into ImageJ 1.x to allow plugging Fiji's Script Editor instead of
ImageJ 1.x limited text editor. So we move this part of Fiji to
ImageJ2, just as we already moved the launcher and the updater.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>