Module API (#32). r=waylonis, bryner

- Introduces a standard API for dealing with modules.  MinidumpModule
   is now a concrete implementation of this API.  Code may interact with
   single modules using the CodeModule interface, and collections of
   modules using its container, the CodeModules interface.
 - CodeModule is used directly by SymbolSupplier implementations and
   SourceLineResolver.  Reliance on the specific implementation in
   MinidumpModule has been eliminated.
 - Module lists are now added to ProcessState objects.  Module references
   in each stack frame are now pointers to objects in these module lists.
 - The sample minidump_stackwalk tool prints the module list after printing
   all threads' stacks.

http://groups.google.com/group/airbag-dev/browse_frm/thread/a9c0550edde54cf8


git-svn-id: http://google-breakpad.googlecode.com/svn/trunk@74 4c0a9323-5329-0410-9bdc-e9ce6186880e

src/processor/testdata/minidump2.stackwalk.out

@@ -17,3 +17,18 @@ Thread 0 (crashed)
     eip = 0x0040395c   esp = 0x0012ff78   ebp = 0x0012ffc0
  3  kernel32.dll!BaseProcessStart + 0x22
     eip = 0x7c816fd7   esp = 0x0012ffc8   ebp = 0x0012fff0
+
+Loaded modules:
+0x00400000 - 0x0042afff  test_app.exe  ???  (main)
+0x59a60000 - 0x59b00fff  dbghelp.dll  5.1.2600.2180
+0x76390000 - 0x763acfff  imm32.dll  5.1.2600.2180
+0x76bf0000 - 0x76bfafff  psapi.dll  5.1.2600.2180
+0x774e0000 - 0x7761cfff  ole32.dll  5.1.2600.2726
+0x77c00000 - 0x77c07fff  version.dll  5.1.2600.2180
+0x77c10000 - 0x77c67fff  msvcrt.dll  7.0.2600.2180
+0x77d40000 - 0x77dcffff  user32.dll  5.1.2600.2622
+0x77dd0000 - 0x77e6afff  advapi32.dll  5.1.2600.2180
+0x77e70000 - 0x77f00fff  rpcrt4.dll  5.1.2600.2180
+0x77f10000 - 0x77f56fff  gdi32.dll  5.1.2600.2818
+0x7c800000 - 0x7c8f3fff  kernel32.dll  5.1.2600.2945
+0x7c900000 - 0x7c9affff  ntdll.dll  5.1.2600.2180