fix: be consistent with casing of Ccp

[TrueBrain]

While trying to compile this repository under Linux (as one does), I ran against the fact that it is a bit messy how files are named:

• Some are prefixed with CCP
• Most are prefixed with Ccp

Now this on its own wouldn't be an issue, was it not that the CMakeLists.txt sometimes refers to the "wrong" variant, causing Linux to go: "I don't know this CCPMemoryTracker.cpp you are talking about".

The fix could be in two ways:

1. only fix CMakeLists.txt to pick the right variant.
2. what this PR does: rename all files / imports consistently to the variant most used.

The side-effect of 2) is that other projects depending on this library also have to fix their casing; but given this library already failed to compile on a case sensitive filesystem, I assume that isn't that much of a problem :)

And yes, there are more compile issue on Linux in this repository (and I understand this library only targets Windows / MacOS); but, if you are interested, that is for another day :)

PS: Fix solution 1) would look something like this:

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 4279b02..c06e7f1 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -20,12 +20,12 @@ set(SRC_FILES
         CcpCore.cpp
         CCPAssert.cpp
         CCPCallstack.cpp
-        CCPDefines.cpp
+        CcpDefines.cpp
         CcpFileUtils.cpp
         CCPHash.cpp
         CCPMemory.cpp
         CCPMemoryTracker.cpp
-        CCPMemoryTrackerMutex.h
+        CcpMemoryTrackerMutex.h
         CcpProcess.cpp
         CcpSecureCrt.cpp
         CcpSemaphore.cpp

Much smaller. But doesn't remove the actual confusing CCP vs Ccp. Hence this PR. But I have no issues changing it into the above.

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Full disclosure: I work for Fenris Creations, although I have no involved with the Carbon project. I work on this in my free time under my own name.