Rename ISR -> Isr to avoid clash with AVR libc ISR #define

src/modules/motion.cpp

@@ -100,7 +100,7 @@ st_timer_t Motion::Step() {
     return next;
 }
 
-void ISR() {}
+void Isr() {}
 
 } // namespace motion
 } // namespace modules

src/modules/motion.h

@@ -203,7 +203,7 @@ private:
 };
 
 /// ISR stepping routine
-extern void ISR();
+extern void Isr();
 
 extern Motion motion;
 

src/modules/timebase.cpp

@@ -9,7 +9,7 @@ Timebase timebase;
 void Timebase::Init() {
 }
 
-void Timebase::ISR() {
+void Timebase::Isr() {
 }
 
 uint16_t Timebase::Millis() const {

src/modules/timebase.h

@@ -23,7 +23,7 @@ public:
 
 private:
     uint16_t ms;
-    static void ISR();
+    static void Isr();
 };
 
 /// The one and only instance of Selector in the FW

tests/unit/modules/stubs/stub_timebase.cpp

@@ -10,7 +10,7 @@ uint16_t millis = 0;
 
 void Timebase::Init() {}
 
-void Timebase::ISR() {}
+void Timebase::Isr() {}
 
 uint16_t Timebase::Millis() const {
     return millis;