Defer creation of locking model to ActivateOptions()

[FreeAndNil]

The creation of the locking model instance is now deferred to ActivateOptions() so that defaultLockingModelType has an effect.

• include pdb file in nuget package fpr better debugging experience

@fluffynuts Could you please review?

[fluffynuts]

@FreeAndNil most of the changes here are whitespace, except:

1. not setting m_lockingModel at line 1660
2. working around pdb files not being in the nuget package

I'm not 100% sure we want to expand the package size with the pdbs, considering the audience size of log4net. I'm open to be convinced here though (personally, since I use Rider, I can decompile any external sources enough to debug with, so pdbs have been of limited value). Please revert all the other files so that the impact is kept smaller.

[FreeAndNil]

Hi @fluffynuts,

i've reverted all the spacing changes.

Regards