Fix MAGN-2213 Crash while placing custom node downloaded from Package Manager
Merge pull request #1286 from Benglin/MAGN-2213

Merging this in due to its urgent nature (testing impact).
Add mapping between callsite and graph UI node
Test cleanup

- Fixed few NUNIT failures due to missing math.dll, replaced the call to
use DSCoreNodes.dll which implements Math class
- The validation for few node migration tests have been updated.
Merge pull request #1287 from sharadkjaiswal/DataMarshaling

Test cleanup
Merge branch 'ChocoButter-2Become1' into node_mapping
Fix gitignore and re-track ASM folder.
Update ASM ignore.
Fix regressions
Rename LiveRunner.GetAstNodes() to LiveRunner.GetSSANodes()
Merge pull request #1288 from ke-yu/node_mapping

Node mapping between callsite and graph UI node
Fixes Null marshaling in collection and List tests

- CollectionMarshaler was throwing exception when any item was null
while getting the approx DS type of the items in the collection. Fixed
this by proper null check.
- Removed ArbitraryDimensionArrayImport from IList parameters as by
default IList will be marshaled as arbitrary dimension array.
- ArbitraryDimensionArrayImport attribute is applied to item parameter
of AddItemToFront method, so that a collection can be added to the front
of the list.
- indices parameter of method List.RemoveItemAtIndex is changed to int[]
from object so that only integers are passed. VM will automatically
promote single object to a collection while calling this method.
Added a test case for list with null element
Before running an expression, clearing its associated warnings
Changed the migration of Compare nodes
Added input type casting for "List.Sublists"

To support non-integer (double) inputs
Marked test case as inconclusive

- Dynamo.Nodes.Formula
Merge pull request #1292 from ke-yu/fix_spurious_error

Before running an expression, clearing its associated warnings
Merge pull request #1293 from ellensi/ChocoButter-2Become1

Various fixes
Merge pull request #1290 from sharadkjaiswal/DataMarshaling

Fixes Null marshaling in collection and List tests