feat: add C++ port of isspam with updated tokenizer and benchmark integration

Add a new C++ implementation of the isspam text analysis tool in retoor_c/isspam.cpp, mirroring the C version's functionality with thread-based file analysis. Update the Makefile with a build_cpp target and add the new binary to .gitignore. Modify bench.py to include timing for the C++ executable. Fix the C tokenizer's delimiter string from punctuation-only to include all standard whitespace characters (\f\v\r\n\t).

Makefile

@@ -1,20 +1,20 @@
 CC = gcc 
 CFLAGS = -Ofast
 
-all: build run valgrind build_risspam run_risspam
+all: build run valgrind build_risspam run_risspam build_cpp
 
 build:
 	@echo "Compiling retoor_c project.".
-	@# removed -pedantic flag because it doesn't accept ' for formatting numbers 
-	@# using printf
 	@$(CC) $(CFLAGS) retoor_c/isspam.c -o isspam
 
+build_cpp:
+	@echo "Compiling C++ version of isspam."
+	@g++ -Ofast retoor_c/isspam.cpp -o isspam_cpp
 
 build_risspam:
 	@echo "Compiling 12bitfloat_risspam project."
 	cd 12bitfloat_rust/risspam && cargo run --release && cp target/release/risspam ../../
 
-
 run: run_spam wl run_not_spam
 run_risspam: run_spam_risspam run_not_spam_risspam
 
@@ -36,7 +36,6 @@ run_spam_risspam:
 run_not_spam_risspam:
 	@./risspam ./not_spam/*.txt
 
-
 valgrind: build 
 	valgrind ./isspam ./spam/*.txt