load-r3.js: add try_set_console() + minor changes
load-r3.js: add try_set_console() + minor changes

1. try_set_console() searches for an element with id 'console_out'
and use it for console messages;
so, better to place such an element before load-r3.js script.

2. create an alias 'load_r3' for 'r3_ready_promise'.

3. onGuiInitialized() now is a no-op, for back-compatibility.

4. use console.info instead of console.log

hostilefork/rebol,giuliolunati/ren-c,giuliolunati/ren-c,draegtun/ren-c,draegtun/ren-c,giuliolunati/ren-c,draegtun/ren-c,rgchris/ren-c,hostilefork/rebol,draegtun/ren-c,giuliolunati/ren-c,giuliolunati/ren-c,rgchris/ren-c,hostilefork/rebol,hostilefork/rebol,draegtun/ren-c,draegtun/ren-c,hostilefork/rebol,rgchris/ren-c,rgchris/ren-c,rgchris/ren-c,hostilefork/rebol