Improve gitignore file for VS.

Improve gitignore to ignore Visual Studio build directories and other VS generated files not wanted in version control.

.gitignore

@@ -1,49 +1,13 @@
 cppcheck
-src/checkautovariables.o
+*.o
-src/checkbufferoverrun.o
+*.bak
-src/checkclass.o
+# VS generated files
-src/checkdangerousfunctions.o
+*.ncb
-src/checkfunctionusage.o
+*.suo
-src/checkheaders.o
+*.user
-src/checkmemoryleak.o
-src/checkother.o
-src/checksecurity.o
-src/checkstl.o
-src/cppcheck.o
-src/cppcheckexecutor.o
-src/errorlogger.o
-src/filelister.o
-src/main.o
-src/preprocessor.o
-src/settings.o
-src/threadexecutor.o
-src/token.o
-src/tokenize.o
-test/testautovariables.o
-test/testbufferoverrun.o
-test/testcharvar.o
-test/testclass.o
-test/testconstructors.o
-test/testcppcheck.o
-test/testdangerousfunctions.o
-test/testdivision.o
-test/testfilelister.o
-test/testfunctionusage.o
-test/testincompletestatement.o
-test/testmemleak.o
-test/testmemleakmp.o
-test/testother.o
-test/testpreprocessor.o
-test/testredundantif.o
-test/testrunner.o
-test/testsecurity.o
-test/testsimplifytokens.o
-test/teststl.o
-test/testsuite.o
-test/testtoken.o
-test/testtokenize.o
-test/testunusedprivfunc.o
-test/testunusedvar.o
 testrunner
 tools/dmake
 tools/errmsg
+# VS build files
+Build/
+BuildTmp/