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.xml

@@ -2538,17 +2538,6 @@ This should be as low as possible, but too low may break functionality</string>
 		<integer>1</integer>
     </map>
     <!-- Standard SL options (To my knowledge) -->
-    <key>CrashHostUrl</key>
-    <map>
-      <key>Comment</key>
-      <string>A URL pointing to a crash report handler; overrides cluster negotiation to locate crash handler.</string>
-      <key>Persist</key>
-      <integer>1</integer>
-      <key>Type</key>
-      <string>String</string>
-      <key>Value</key>
-      <string>http://crash.singularityviewer.org/report.php</string>>
-    </map>
     <key>AFKTimeout</key>
     <map>
       <key>Comment</key>
@@ -18971,24 +18960,13 @@ This should be as low as possible, but too low may break functionality</string>
     <key>CrashSubmitBehavior</key>
     <map>
       <key>Comment</key>
-      <string>Controls behavior when viewer crashes (0 = ask before sending crash report, 1 = always send crash report, 2 = never send crash report)</string>
+      <string>Controls behavior when viewer crashes (0 = never send crash report, 1 = always send crash report)</string>
       <key>Persist</key>
       <integer>1</integer>
       <key>Type</key>
       <string>S32</string>
       <key>Value</key>
-      <integer>0</integer>
-    </map>
-    <key>CrashReportID</key>
-    <map>
-      <key>Comment</key>
-      <string>ID of the last crash report sent. Zero indicates that no crash report has been sent. Non-zero value can be useful infermation for developers to track a specific issue</string>
-      <key>Persist</key>
-      <integer>1</integer>
-      <key>Type</key>
-      <string>S32</string>
-      <key>Value</key>
-      <integer>0</integer>
+      <integer>-1</integer>
     </map>
 
     <key>EveryoneCopy</key>