refactor: use standard integer types; remove <algorithm> dependency

- Replaced unsigned char,  int and long long with uint8_t int32_t and int64_t for platform independence
- Removed <algorithm> dependency, implemented custom alternatives

Makefile

@@ -10,10 +10,10 @@ CC := arm-none-eabi-gcc
 CXX := arm-none-eabi-g++
 AR := arm-none-eabi-ar
 CXXFLAGS := -static -static-libstdc++ -std=c++17 -fPIC -Wl,--as-needed \
-			-Wall -Wextra \
+			-pedantic -Wall -Wextra \
 			-fmessage-length=0 -mfpu=vfpv3 -mfloat-abi=hard \
 			-I. -I./cx9261A_api
-CFLAGS := -std=c17 -Wall -Wextra \
+CFLAGS := -std=c17 -pedantic -Wall -Wextra \
 			-fmessage-length=0 -mfpu=vfpv3 -mfloat-abi=hard \
 			-I.
 DEBUG_FLAGS := -fdebug-prefix-map=$(CURDIR)/=/tmp/dbg/cx9261a_c/ \