Added support for web request logging (log file format version 2)

* Set file format version to 2
* Added scope types WebRequestStart and WebRequestEnd
* Added thread-static FL.WebRequestId tracking
* Added WebRequestId field to log item base class
* Added WebRequestData class that contains data about a web request
* FieldLogViewer: Added WebRequestId info to all details views, if it's not 0
* FieldLogViewer: Added WebRequestData view to WebRequestStart scope items
* FieldLogViewer: Added quick filter by same request
* FieldLogViewer: Added new web request fields to the filter
Fixed occasional exception in SaveScrolling()
Added web request scope icons
Metadata token and offsets of StackFrames as new fields (file format v2)
New ASP.NET version of the FieldLog library

* Renamed projects to properly describe their target framework and version
* Added new ASPNET40 version that includes log helper methods for ASP.NET applications
* The setup now uses the signed version of Unclassified.FieldLog.dll
Web request duration measurement with filter support
Added build target to the assembly version attribute
Merge branch 'master' into webrequest
Keep a copy of the WebRequestId in HttpContext.Items
Log HTTP method (with filter support) and POST data
Added more quick filters
Merge branch 'master' into webrequest
Removed StackFrame native offset (it's useless anyway)
Added AssemblyConfigurationAttribute to code and log (file format v2)
Added source code resolver with .pdb file converter

The PdbConvert tool converts an assembly's .pdb symbols file to an XML file that can be used to resolve source code locations from StackFrames without deploying the .pdb files. What .NET would do at runtime is now deferred until the log is viewed and the XML file is loaded into FieldLogViewer. The XML file must be created for the exact assembly, best directly after the build, and kept for future reference.
PdbConvert and CommandLineHelper updates
Integrated PdbConvert in the build process and included it in the setup
Added exception type metadata token for future resolving or de-obfuscation
New log file format specification document
Revised file format specification