58: Rebuild FSX Shader Cache

When FSX was run the first time, a cache was also created under the C:\Users\<user name>\AppData\Local\Microsoft\FSX folder.   It contains a sub-folder called Shaders (some systems may have an additional folder called Shader10) in which instructions and codes that are frequently accessed by FSX are stored.  Every time FSX is run, contents of the cache will be optimized further to improve overall system performance.

C:\Users\Tom\AppData\Local\Microsoft\FSX

However, this cache is prone to be messed up when settings of fsx.CFG are changed or system is toggled between DX9 and DX10, etc.

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