logs: replace every fmt::print with a lg call instead (#1368)

Favors the `lg` namespace over `fmt` directly, as this will output the
logs to a file / has log levels.

I also made assertion errors go to a file, this unfortunately means
importing `lg` and hence `fmt` which was attempted to be avoided before.
But I'm not sure how else to do this aspect without re-inventing the
file logging.

We have a lot of commented out prints as well that we should probably
cleanup at some point / switch them to trace level and default to `info`
level.

I noticed the pattern of disabling debug logs behind some boolean,
something to consider cleaning up in the future -- if our logs were more
structured (knowing where they are coming from) then a lot this
boilerplate could be eliminated.

Closes #1358

decompiler/IR2/bitfields.cpp

@@ -1,6 +1,7 @@
 #include "bitfields.h"
 
 #include "common/goos/PrettyPrinter.h"
+#include "common/log/log.h"
 #include "common/util/BitUtils.h"
 #include "common/util/Range.h"
 
@@ -563,7 +564,7 @@ FormElement* BitfieldAccessElement::push_step(const BitfieldManip step,
 
     // in this case, we expect the value we're oring with to be the appropriate mask for the field.
 
-    fmt::print("Rare bitfield set!\n");
+    lg::info("Rare bitfield set!");
     u64 value = step.amount;
     auto type = ts.lookup_type(m_type);
     auto as_bitfield = dynamic_cast<BitFieldType*>(type);
@@ -621,7 +622,7 @@ FormElement* BitfieldAccessElement::push_step(const BitfieldManip step,
   }
   lg::error("Current: {}", step.print());
   if (m_got_pcpyud) {
-    lg::error("Got pcpyud\n");
+    lg::error("Got pcpyud");
   }
 
   throw std::runtime_error("Unknown state in BitfieldReadElement");