Gtk2-CV-1.9

Changes for version 1.9 - 2021-05-09

INCOMPATIBLE CHANGE: .cvrc is now sourced much earlier, before loading modules. cvrc_boot and cvrc_start functions are called later.
INCOMPATIBLE CHANGE: mplayer support has been completely removed.
INCOMPATIBLE CHANGE: viewer now defaults to "maxpect" (shift-M) mode.
"invisible" cursor does not act weirdly when it is in position zero (ctrl-u, space did not advance if cursor was on first item in schnauzer).
support heif/avif now via pixbufloader (which seesm to not have working autodetection, so we do our own).
cv now uses mpv to generate video thumbnails - maybe slower, maybe overall worse, but at least there is no dependency on mplayer anymore.
cv now expects mpv to be in the CV_MPV, not CV_MPALYER, env variable.
the Schnauzer now autoscales everything according to the first monitor's DPI when the dpi is >= 110. This can be disabled by adding this to your .cvrc: $Gtk2::CV::Schnauzer::DISPLAYSCALE = 1;
redid "splash" image to be 16:9 (and also super-ugly, but nobody cares).
support mpv's --input-ipc-file option, in addition to --input-file (untested).
rather brutally remove LC_ALL and override LC_NUMERIC, as perl and gtk2 sometimes fail to format numbers correctly and fall back to the locale-specific format (which perl should never do).
added a "Subdir view", showing only subdirectories in the cluster view and immediately entering them.
add .cvrc changable variable $Gtk2::CV::Schnauzer::DISPLAYSCALE, defaults to 1 - for use with hidpi displays.
add .cvrc changable variable $Gtk2::CV::Schnauzer::ICONSCALE, defaults to 1 - modifies actual icon file size.
add .cvrc changable variable $Gtk2::CV::Schnauzer::FONTSCALE, defaults to icon scale - modified icon font height.
while CV is effectively single-threaded, it might need thread support to be initialized in Gtk2/xcb.
remove hyper scaling mode.
"," is now the opposite (modulo rounding) from ".".
do not duplicate filetype detection in schnauzer and CV.xs, always use the xs code.