Revert "Project modernization (#630)"

This code was not tested and breaks in Release builds, reverting to restore
functionality of the nightly. All in-game menus do not work and generating
a world crashes.

This reverts commit a9be52c41a.

Minecraft.Client/PSVita/PSVitaExtras/zlib.h

@@ -91,7 +91,7 @@ typedef struct z_stream_s {
     uInt     avail_out; /* remaining free space at next_out */
     uLong    total_out; /* total number of bytes output so far */
 
-    z_const char *msg;  /* last error message, nullptr if no error */
+    z_const char *msg;  /* last error message, NULL if no error */
     struct internal_state FAR *state; /* not visible by applications */
 
     alloc_func zalloc;  /* used to allocate the internal state */
@@ -1254,7 +1254,7 @@ ZEXTERN gzFile ZEXPORT gzopen OF((const char *path, const char *mode));
    reading, this will be detected automatically by looking for the magic two-
    byte gzip header.
 
-     gzopen returns nullptr if the file could not be opened, if there was
+     gzopen returns NULL if the file could not be opened, if there was
    insufficient memory to allocate the gzFile state, or if an invalid mode was
    specified (an 'r', 'w', or 'a' was not provided, or '+' was provided).
    errno can be checked to determine if the reason gzopen failed was that the
@@ -1277,7 +1277,7 @@ ZEXTERN gzFile ZEXPORT gzdopen OF((int fd, const char *mode));
    close the associated file descriptor, so they need to have different file
    descriptors.
 
-     gzdopen returns nullptr if there was insufficient memory to allocate the
+     gzdopen returns NULL if there was insufficient memory to allocate the
    gzFile state, if an invalid mode was specified (an 'r', 'w', or 'a' was not
    provided, or '+' was provided), or if fd is -1.  The file descriptor is not
    used until the next gz* read, write, seek, or close operation, so gzdopen
@@ -1377,7 +1377,7 @@ ZEXTERN char * ZEXPORT gzgets OF((gzFile file, char *buf, int len));
    string is terminated with a null character.  If no characters are read due
    to an end-of-file or len < 1, then the buffer is left untouched.
 
-     gzgets returns buf which is a null-terminated string, or it returns nullptr
+     gzgets returns buf which is a null-terminated string, or it returns NULL
    for end-of-file or in case of error.  If there was an error, the contents at
    buf are indeterminate.
 */
@@ -1393,7 +1393,7 @@ ZEXTERN int ZEXPORT gzgetc OF((gzFile file));
      Reads one byte from the compressed file.  gzgetc returns this byte or -1
    in case of end of file or error.  This is implemented as a macro for speed.
    As such, it does not do all of the checking the other functions do.  I.e.
-   it does not check to see if file is nullptr, nor whether the structure file
+   it does not check to see if file is NULL, nor whether the structure file
    points to has been clobbered or not.
 */