cpplint: Ignore some uses of `using namespace`

While `using namespace` certainly has its downsides, in these cases, the scope
is local to a single file, and makes the code _much_ more readable, offsetting
any downsides the directive otherwise has. As such, lets tell cpplint to ignore
these.

Signed-off-by: Gergely Nagy <algernon@keyboard.io>

examples/Internal/Sketch_Exploration/Sketch_Exploration.ino

@@ -44,7 +44,7 @@ KEYMAPS(
 )
 /* *INDENT-ON* */
 
-using namespace kaleidoscope::sketch_exploration;
+using namespace kaleidoscope::sketch_exploration; // NOLINT(build/namespaces)
 
 class BPlugin : public kaleidoscope::Plugin {};
 class CPlugin : public kaleidoscope::Plugin {};

src/kaleidoscope/device/virtual/DefaultHIDReportConsumer.cpp

@@ -29,7 +29,7 @@
 
 namespace kaleidoscope {
 
-using namespace logging;
+using namespace logging; // NOLINT(build/namespaces)
 
 // For each bit set in 'bitfield', output the corresponding string to 'stream'
 #define FOREACHBIT(bitfield, stream, str0, str1, str2, str3, str4, str5, str6, str7) \

src/kaleidoscope/device/virtual/Virtual.cpp

@@ -53,7 +53,7 @@ namespace kaleidoscope {
 namespace device {
 namespace virt {
 
-using namespace kaleidoscope::logging;
+using namespace kaleidoscope::logging; // NOLINT(build/namespaces)
 
 //##############################################################################
 // VirtualKeyScanner

src/kaleidoscope/plugin/LEDControl.cpp

@@ -19,7 +19,7 @@
 #include "kaleidoscope_internal/LEDModeManager.h"
 #include "kaleidoscope/keyswitch_state.h"
 
-using namespace kaleidoscope::internal;
+using namespace kaleidoscope::internal; // NOLINT(build/namespaces)
 
 namespace kaleidoscope {
 namespace plugin {