Enable compiler warnings, remove dead code, fix unused variable

CMakeLists.txt

@@ -20,6 +20,8 @@ target_include_directories(picomap PRIVATE
 	w6300
 )
 
+target_compile_options(picomap PRIVATE -Wall -Wextra -Wno-unused-parameter)
+
 pico_generate_pio_header(picomap ${CMAKE_CURRENT_LIST_DIR}/w6300/pio.pio)
 
 pico_enable_stdio_usb(picomap 1)

include/msgpackpp.h

@@ -434,7 +434,6 @@ public:
   result<parser> next() const {
     auto hdr = header_byte();
     if (!hdr) return std::unexpected(hdr.error());
-    uint8_t b = *hdr;
 
     if (is_array()) {
       auto info = get_body_info(m_p, m_size);

w6300/w6300.cpp

@@ -664,12 +664,6 @@ void wiz_recv_ignore(uint8_t sn, uint16_t len) {
     setSn_RX_RD(sn, getSn_RX_RD(sn) + len);
 }
 
-void wiz_delay_ms(uint32_t milliseconds) {
-    for (uint32_t i = 0; i < milliseconds; i++) {
-        setTCNTRCLR(0xff);
-        while (getTCNTR() < 0x0a) {}
-    }
-}
 
 void wiz_mdio_write(uint8_t phyregaddr, uint16_t var) {
     setPHYRAR(phyregaddr);