removed dead variables and make variables static

this saves a bunch of flash space and lets the compiler do a better
job of optimising

Mcu/f031/Src/stm32f0xx_it.c

@@ -60,8 +60,6 @@ extern void PeriodElapsedCallback();
 extern void tenKhzRoutine();
 extern char servoPwm;
 
-// extern uint32_t gcr[];
-// extern uint8_t gcr_size;
 char input_ready = 0;
 int update_interupt = 0;
 uint8_t update_count = 0;

Src/dshot.c

@@ -12,33 +12,32 @@
 #include "sounds.h"
 #include "targets.h"
 
-int dpulse[16] = { 0 };
+static int dpulse[16];
 
-const char gcr_encode_table[16] = {
+static const char gcr_encode_table[16] = {
     0b11001, 0b11011, 0b10010, 0b10011, 0b11101, 0b10101, 0b10110, 0b10111,
     0b11010, 0b01001, 0b01010, 0b01011, 0b11110, 0b01101, 0b01110, 0b01111
 };
 
-char EDT_ARM_ENABLE = 0;
+char EDT_ARM_ENABLE;
 char EDT_ARMED = 0;
-int shift_amount = 0;
-uint32_t gcrnumber;
+static int shift_amount;
+static uint32_t gcrnumber;
 extern int zero_crosses;
 extern char send_telemetry;
 extern uint8_t max_duty_cycle_change;
-int dshot_full_number;
+static int dshot_full_number;
 extern char play_tone_flag;
-uint8_t command_count = 0;
-uint8_t last_command = 0;
-uint8_t high_pin_count = 0;
-uint32_t gcr[37] = { 0 };
-uint16_t dshot_frametime;
-uint16_t dshot_goodcounts;
-uint16_t dshot_badcounts;
-char dshot_extended_telemetry = 0;
-uint16_t send_extended_dshot = 0;
-uint16_t processtime = 0;
-uint16_t halfpulsetime = 0;
+static uint8_t command_count;
+static uint8_t last_command;
+static uint8_t high_pin_count;
+uint32_t gcr[37];
+static uint16_t dshot_frametime;
+static uint16_t dshot_goodcounts;
+static uint16_t dshot_badcounts;
+char dshot_extended_telemetry;
+uint16_t send_extended_dshot;
+static uint16_t halfpulsetime;
 
 void computeDshotDMA()
 {