Remove the double empty lines from all source files (#2009)

* Run dos2unix for all source files

* Remove the trail space from all source files

* Remove the double empty lines from all source files

scripts/lv_conf_checker.py

@@ -4,7 +4,6 @@
 Generates a checker file for lv_conf.h from lv_conf_template.h define all the not defined values
 '''
 
-
 import sys
 import re
 
@@ -15,7 +14,6 @@ if sys.version_info < (3,6,0):
 fin = open("../lv_conf_template.h", "r")
 fout = open("../src/lv_conf_internal.h", "w")
 
-
 fout.write(
 '''/**
  * GENERATED FILE, DO NOT EDIT IT!
@@ -82,7 +80,7 @@ for i in fin.read().splitlines():
   if '/*--END OF LV_CONF_H--*/' in i: break
 
   r = re.search(r'^ *# *define ([^\s]+).*$', i)
-  
+
 #ifndef LV_USE_BTN               /*Only if not defined in lv_conf.h*/
 #  ifdef CONFIG_LV_USE_BTN    /*Use KConfig value if set*/
 #    define LV_USE_BTN  CONFIG_LV_USE_BTN
@@ -90,7 +88,7 @@ for i in fin.read().splitlines():
 #    define LV_USE_BTN      1      /*Use default value*/
 #  endif
 #endif
-  
+
   if r:
     line = re.sub('\(.*?\)', '', r[1], 1)    #remove parentheses from macros
     dr = re.sub('.*# *define', '', i, 1)
@@ -110,7 +108,6 @@ for i in fin.read().splitlines():
   else:
     fout.write(f'{i}\n')
 
-
 fout.write(
 '''