[LAA] Ardour 2.8.9 released

Just a couple of days since 2.8.8, and Ardour 2.8.9 is available from http://ardour.org/download Why? It turned out that the infamous mute bug (which caused the mute button to do nothing) was actually not fixed in 2.8.8 (or prior versions where this has been claimed). This has been one of the worst regressions of recent versions of Ardour, and I mistakenly blamed packagers and distributions for it. Thankfully ardour.org member the_CLA spent time with me on IRC and we finally proved to my satisfaction that the bug was really in Ardour. Its now fixed, hopefully forever. In addition, a new Ardour user on OS X pointed out two rather unfortunate problems that have now been fixed: * If a plugin has existing presets, the preset selector in the plugin editor window would steal key events, possibly causing an unintentional (and unrecoverable) reset of the plugin state (very annoying) * All canvas items except for the text used to label and regions could have their color adjusted. These two exceptions have now been added to the set of things that can be tweaked by, for example, a color-blind user, or someone who just wants dark colors for tracks and white text on region names. Many thanks to the_CLA and Maurits Lamers for patiently getting me to understand these 3 bugs.