FMSLogo Code

Merge in changes from trunk, mostly to get CFileStream refactoring

Refactoring: Make CFileStream reference a CFileListNode
This eliminates the need to copy the information from CFileListNode to CFileStream, but also makes it easy to transfer state from the active reader/writer to the file stream, as will likely need to be done to support Unicode.

Fix a typo in a comment
Include $LDFLAGS in double-quotes, in case it contains a "-".

Merge in changes from trunk (to get Unicode installer)

Update the installer to be in Unicode.

Update instructions on setting up build environment based on recent experience on Windows 10

Update the build to use NSIS 3.0.
This is what someone would naturally install if trying to build FMSLogo today.

Merge in changes from trunk, mostly to get updates to files.cpp

Fix typo: "the play commands starts" -> "the play command starts"

Add missing <userinput> tags to improve readability.