Add lua-format config and auto-format all exercises

.lua-format

@@ -0,0 +1,33 @@
+column_limit: 80
+indent_width: 1
+use_tab: true
+tab_width: 4
+continuation_indent_width: 1
+spaces_before_call: 1
+keep_simple_control_block_one_line: true
+keep_simple_function_one_line: false
+align_args: true
+break_after_functioncall_lp: false
+break_before_functioncall_rp: false
+spaces_inside_functioncall_parens: false
+spaces_inside_functiondef_parens: false
+align_parameter: true
+chop_down_parameter: false
+break_after_functiondef_lp: false
+break_before_functiondef_rp: false
+align_table_field: true
+break_after_table_lb: true
+break_before_table_rb: true
+chop_down_table: false
+chop_down_kv_table: true
+table_sep: ","
+extra_sep_at_table_end: false
+column_table_limit: 0
+column_table_limit_kv: 0
+spaces_inside_table_braces: false
+break_after_operator: true
+double_quote_to_single_quote: false
+single_quote_to_double_quote: false
+spaces_around_equals_in_field: true
+line_breaks_after_function_body: 1
+line_separator: input

.template.lua

@@ -1,5 +1,4 @@
 -- Solution --------------------------------------------------------------------
-
 function f()
 	-- Your implementation here
 end

anagrams.lua

@@ -1,5 +1,4 @@
 -- Solution --------------------------------------------------------------------
-
 function is_anagram(str1, str2)
 	-- Your implementation here
 end

greatest_common_divisor.lua

@@ -1,5 +1,4 @@
 -- Solution --------------------------------------------------------------------
-
 function greatest_common_divisor(x, y)
 	-- Your implementation here
 end

hamming_distance.lua

@@ -1,5 +1,4 @@
 -- Solution --------------------------------------------------------------------
-
 function hamming_distance(str1, str2)
 	-- Your implementation here
 end

leap_years.lua

@@ -1,5 +1,4 @@
 -- Solution --------------------------------------------------------------------
-
 function is_leap_year(year)
 	-- Your implementation here
 end

prime_numbers.lua

@@ -1,5 +1,4 @@
 -- Solution --------------------------------------------------------------------
-
 function is_prime(x)
 	-- Your implementation here
 end

queen_threats.lua

@@ -1,5 +1,4 @@
 -- Solution --------------------------------------------------------------------
-
 function is_queen_threat(queen_position, pawn_position)
 	-- Your implementation here
 end

resistor_colours.lua

@@ -1,5 +1,4 @@
 -- Solution --------------------------------------------------------------------
-
 -- Give the colours whatever values are convenient
 black = undefined
 brown = undefined