[Lazarus] FPC & Lazarus installation including cross compiling from source

[patspiper]

This is related to bug 0021580: Feature request: Robust IDE cross-compiling.

With Lazarus 1.0 being closer than ever, and with the availability of 
different Linux scripts to compile FPC from source (including cross 
compilation), maybe the time has come to have an automated installer 
that does all that, including the compilation of the cross binutils.

The complement for Lazarus would be the ability to import/export the 
default project options with build modes. My default build modes include 
Default, Linux/i386, Win32/i386, Linux/arm, and WinCE/arm.

The 1st base question that comes to mind is: What is the optimal folder 
structure to contain FPC with different versions, lazarus, the cross 
binutils, and all related sources?

Stephano