Reorganize the project layout, fix some logging quirks

Signed-off-by: Shin'ya Minazuki <shinyoukai@laidback.moe>

Taskfile.yml

@@ -6,8 +6,7 @@ env:
   GO: go
 
 vars:
-  IMPORT: git.laidback.moe/shinyoukai/mikuru
-  DIR: ./cmd
+  IMPORT: git.laidback.moe/shinyoukai/mikuru/mirai
 tasks:
   default:
     cmds:
@@ -15,7 +14,7 @@ tasks:
   build:
     desc: Build the client
     cmds:
-      - $GO build -ldflags='-s -w -X "{{.IMPORT}}.Version={{.VERSION}}" -X "{{.IMPORT}}.Revision={{.REVISION}}"' -v -o mikuru {{.DIR}}
+      - $GO build -ldflags='-s -w -X "{{.IMPORT}}.Version={{.VERSION}}" -X "{{.IMPORT}}.Revision={{.REVISION}}"' -v
     vars:
       REVISION:
         sh: git rev-list --all | wc -l | tr -d ' '