Port Crashpad support from alchemy, with some small tweaks

Moved initCrashReporting into LLAppViewer, everything we use there is
crossplatform enough that duplicating code is silly

Removes unused gCrashSettings
Adds MBFatalError, that's right, Crash Loop is now translatable!
Adds consent notification prompt to first login... enjoy that, everyone.

indra/newview/app_settings/settings_files.xml

@@ -43,13 +43,6 @@
               <key>Requirement</key>
               <integer>1</integer>
             </map>
-            <key>CrashSettings</key>
-            <map>
-              <key>Name</key>
-              <string>settings_crash_behavior.xml</string>
-              <key>Requirement</key>
-              <integer>1</integer>
-            </map>
           </map>
         </map>
         <key>User</key>
@@ -65,11 +58,6 @@
               <key>NameFromSetting</key>
               <string>ClientSettingsFile</string>
             </map>
-            <key>CrashSettings</key>
-            <map>
-              <key>Name</key>
-              <string>settings_crash_behavior.xml</string>
-            </map>
           </map>
         </map>
         <key>Account</key>