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Closes #1837

Closes #1838

At least try the untranslated one...

Also while at it don't present a ton of dialogs to the user
about this failure, they wouldn't even know what to do with
that information.

This is mostly to fix a bogus translation in es.po

Part of #1440

Part of #1440

Part of #1440

Losely based upon work from PR #1440

Fixes #653

MAC_OS_X_VERSION_MAX_ALLOWED reflects the currently running OS X version
more closely than MAC_OS_X_VERSION_MIN_REQUIRED, given it's defined as
max(current_version, MAC_OS_X_VERSION_MIN_REQUIRED).

Additionally, we should check if MAC_OS_X_VERSION_10_9 is actually
defined, otherwise the whole macro logic breaks apart.

When hexchat is already installed into a non-default prefix, a new build
could pick up ${prefix}/include/hexchat-plugin.h from the installed
version instead of the local header, as configuration variables such as
$(GLIB_CFLAGS) would point to -I${prefix}/include.

Reordering the includes and moving -I arguments to CPPFLAGS prevents
this, as it ensures the local directories are always searched first.

This was no problem when compiling for /usr or /usr/local as these
directories in the compiler search path are always searched last.

Closes #1822

Use the (deprecated) Gestalt functionality for fetching the fine-grained
OS X version number on 10.9 and lower.

The newer NSOperatingSystemVersion structure is only available on
10.10+.

This prevents using invalid chars on Windows or creating directories

This just cleans up the results of git logs

This is just a direct port and should change no logic

Fixes #1759

I can't really think of a reason this would be needed
and since it doesn't do anything, and didn't since xchat,
 might as well remove it.

This relied on undocumented behavior of hexchat_pluginpref_get_int()
that has been fixed recently. -1 is the correct failure value.

On failure it should always return -1, atoi() returns 0.

Fixes #1785

This is currently an issue when building in Flatpak

This probably doesn't catch them all but setting tab color
and printing text at least do not crash in the common case.