Implement RAD-163: command line parameters support

Implement RAD-163: command line parameters support

Radegast -h
Radegast 1.21
Copyright (C) 2009, 2010 Radegast Development Team
http://radegastclient.org/

  -u, --username     Username, use quotes to supply "First Last"

  -p, --password     Account password

  -a, --autologin    Automatially login with provided user credentials

  -g, --grid         Grid ID to login into, try --list-grids to see IDs used
                     for this parameter

  -l, --location     Login location: last, home or regionname. Regioname can
                     also be in format regionname/x/y/z

  --list-grids       Lists grid IDs used for --grid option

  --loginuri         Use this URI to login (don't use with --grid)

  -h, --help         Display this help screen.

Example: automatically login user called Some Resident to his last location on
the Second Life main grid (agni)
Radegast -a -g agni -u "Some Resident" -p "secret"  -l last

Radegast --list-grids
Radegast 1.21
Copyright (C) 2009, 2010 Radegast Development Team
http://radegastclient.org/

Use Grid ID as the parameter for --grid
Grid ID                   - Grid Name
========================================================
agni                      - Second Life (agni)
aditi                     - Second Life Beta (aditi)
osgrid                    - OSGrid
reactiongrid              - ReactionGrid
3rdrock                   - 3rd Rock Grid
inworldz                  - Inworldz
legendcityonline          - Legend City Online
worldsimterra             - WorldSimTerra
youralternativelife       - Your Alternative Life
thenewworldgrid           - The New World Grid
cyberlandia               - Cyberlandia
thegorgrid                - The Gor Grid
giantgrid                 - GiantGrid
localhost                 - Local Host
gridproxy                 - Grid Proxy

git-svn-id: https://radegast.googlecode.com/svn/trunk@691 f7a694da-4d33-11de-9ad6-1127a62b9fcd